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LibGfx: Propagate errors that occur internally in PNGWriter

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This patch basically uses the TRY() macro throughout PNGWriter instead
of relying on the MUST()'ing wrappers in Vector and ByteBuffer.

One FIXME was killed in the making of this patch. :^)
This commit is contained in:
Andreas Kling 2022-12-05 20:49:13 +01:00 committed by Sam Atkins
parent d88c7fee32
commit e19c8897ee
Notes: sideshowbarker 2024-07-17 05:03:11 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/e19c8897ee
Pull-request: https://github.com/SerenityOS/serenity/pull/16327
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/linusg
2 changed files with 85 additions and 72 deletions
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147
Userland/Libraries/LibGfx/PNGWriter.cpp
View file

@ -25,26 +25,26 @@ public:
explicit PNGChunk(DeprecatedString);
auto const& data() const { return m_data; };
DeprecatedString const& type() const { return m_type; };
void reserve(size_t bytes) { m_data.ensure_capacity(bytes); }
ErrorOr<void> reserve(size_t bytes) { return m_data.try_ensure_capacity(bytes); }
template<typename T>
void add_as_big_endian(T);
ErrorOr<void> add_as_big_endian(T);
template<typename T>
void add_as_little_endian(T);
ErrorOr<void> add_as_little_endian(T);
void add_u8(u8);
ErrorOr<void> add_u8(u8);
template<typename T>
void add(T*, size_t);
ErrorOr<void> add(T*, size_t);
void store_type();
ErrorOr<void> store_type();
void store_data_length();
u32 crc();
private:
template<typename T>
requires(IsUnsigned<T>) void add(T);
requires(IsUnsigned<T>) ErrorOr<void> add(T);
ByteBuffer m_data;
DeprecatedString m_type;
@ -53,13 +53,15 @@ private:
PNGChunk::PNGChunk(DeprecatedString type)
: m_type(move(type))
{
add<data_length_type>(0);
store_type();
// NOTE: These are MUST() because they should always be able to fit in m_data's inline capacity.
MUST(add<data_length_type>(0));
MUST(store_type());
}
void PNGChunk::store_type()
ErrorOr<void> PNGChunk::store_type()
{
m_data.append(type().bytes());
TRY(m_data.try_append(type().bytes()));
return {};
}
void PNGChunk::store_data_length()
@ -75,66 +77,75 @@ u32 PNGChunk::crc()
}
template<typename T>
requires(IsUnsigned<T>) void PNGChunk::add(T data)
requires(IsUnsigned<T>) ErrorOr<void> PNGChunk::add(T data)
{
m_data.append(&data, sizeof(T));
TRY(m_data.try_append(&data, sizeof(T)));
return {};
}
template<typename T>
void PNGChunk::add(T* data, size_t size)
ErrorOr<void> PNGChunk::add(T* data, size_t size)
{
m_data.append(data, size);
TRY(m_data.try_append(data, size));
return {};
}
template<typename T>
void PNGChunk::add_as_little_endian(T data)
ErrorOr<void> PNGChunk::add_as_little_endian(T data)
{
auto data_out = AK::convert_between_host_and_little_endian(data);
add(data_out);
TRY(add(data_out));
return {};
}
template<typename T>
void PNGChunk::add_as_big_endian(T data)
ErrorOr<void> PNGChunk::add_as_big_endian(T data)
{
auto data_out = AK::convert_between_host_and_big_endian(data);
add(data_out);
TRY(add(data_out));
return {};
}
void PNGChunk::add_u8(u8 data)
ErrorOr<void> PNGChunk::add_u8(u8 data)
{
add(data);
TRY(add(data));
return {};
}
void PNGWriter::add_chunk(PNGChunk& png_chunk)
ErrorOr<void> PNGWriter::add_chunk(PNGChunk& png_chunk)
{
png_chunk.store_data_length();
u32 crc = png_chunk.crc();
png_chunk.add_as_big_endian(crc);
m_data.append(png_chunk.data().data(), png_chunk.data().size());
TRY(png_chunk.add_as_big_endian(crc));
TRY(m_data.try_append(png_chunk.data().data(), png_chunk.data().size()));
return {};
}
void PNGWriter::add_png_header()
ErrorOr<void> PNGWriter::add_png_header()
{
m_data.append(PNG::header.data(), PNG::header.size());
TRY(m_data.try_append(PNG::header.data(), PNG::header.size()));
return {};
}
void PNGWriter::add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG::ColorType color_type, u8 compression_method, u8 filter_method, u8 interlace_method)
ErrorOr<void> PNGWriter::add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG::ColorType color_type, u8 compression_method, u8 filter_method, u8 interlace_method)
{
PNGChunk png_chunk { "IHDR" };
png_chunk.add_as_big_endian(width);
png_chunk.add_as_big_endian(height);
png_chunk.add_u8(bit_depth);
png_chunk.add_u8(to_underlying(color_type));
png_chunk.add_u8(compression_method);
png_chunk.add_u8(filter_method);
png_chunk.add_u8(interlace_method);
add_chunk(png_chunk);
TRY(png_chunk.add_as_big_endian(width));
TRY(png_chunk.add_as_big_endian(height));
TRY(png_chunk.add_u8(bit_depth));
TRY(png_chunk.add_u8(to_underlying(color_type)));
TRY(png_chunk.add_u8(compression_method));
TRY(png_chunk.add_u8(filter_method));
TRY(png_chunk.add_u8(interlace_method));
TRY(add_chunk(png_chunk));
return {};
}
void PNGWriter::add_IEND_chunk()
ErrorOr<void> PNGWriter::add_IEND_chunk()
{
PNGChunk png_chunk { "IEND" };
add_chunk(png_chunk);
TRY(add_chunk(png_chunk));
return {};
}
union [[gnu::packed]] Pixel {
@ -155,13 +166,13 @@ union [[gnu::packed]] Pixel {
};
static_assert(AssertSize<Pixel, 4>());
void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
ErrorOr<void> PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
{
PNGChunk png_chunk { "IDAT" };
png_chunk.reserve(bitmap.size_in_bytes());
TRY(png_chunk.reserve(bitmap.size_in_bytes()));
ByteBuffer uncompressed_block_data;
uncompressed_block_data.ensure_capacity(bitmap.size_in_bytes() + bitmap.height());
TRY(uncompressed_block_data.try_ensure_capacity(bitmap.size_in_bytes() + bitmap.height()));
Pixel dummy_scanline[bitmap.width()];
auto const* scanline_minus_1 = dummy_scanline;
@ -174,35 +185,37 @@ void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
ByteBuffer buffer {};
int sum = 0;
void append(u8 byte)
ErrorOr<void> append(u8 byte)
{
buffer.append(byte);
TRY(buffer.try_append(byte));
sum += static_cast<i8>(byte);
return {};
}
void append(AK::SIMD::u8x4 simd)
ErrorOr<void> append(AK::SIMD::u8x4 simd)
{
append(simd[0]);
append(simd[1]);
append(simd[2]);
append(simd[3]);
TRY(append(simd[0]));
TRY(append(simd[1]));
TRY(append(simd[2]));
TRY(append(simd[3]));
return {};
}
};
Filter none_filter { .type = PNG::FilterType::None };
none_filter.buffer.ensure_capacity(sizeof(Pixel) * bitmap.height());
TRY(none_filter.buffer.try_ensure_capacity(sizeof(Pixel) * bitmap.height()));
Filter sub_filter { .type = PNG::FilterType::Sub };
sub_filter.buffer.ensure_capacity(sizeof(Pixel) * bitmap.height());
TRY(sub_filter.buffer.try_ensure_capacity(sizeof(Pixel) * bitmap.height()));
Filter up_filter { .type = PNG::FilterType::Up };
up_filter.buffer.ensure_capacity(sizeof(Pixel) * bitmap.height());
TRY(up_filter.buffer.try_ensure_capacity(sizeof(Pixel) * bitmap.height()));
Filter average_filter { .type = PNG::FilterType::Average };
average_filter.buffer.ensure_capacity(sizeof(ARGB32) * bitmap.height());
TRY(average_filter.buffer.try_ensure_capacity(sizeof(ARGB32) * bitmap.height()));
Filter paeth_filter { .type = PNG::FilterType::Paeth };
paeth_filter.buffer.ensure_capacity(sizeof(ARGB32) * bitmap.height());
TRY(paeth_filter.buffer.try_ensure_capacity(sizeof(ARGB32) * bitmap.height()));
auto pixel_x_minus_1 = Pixel::gfx_to_png(*dummy_scanline);
auto pixel_xy_minus_1 = Pixel::gfx_to_png(*dummy_scanline);
@ -211,18 +224,18 @@ void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
auto pixel = Pixel::gfx_to_png(scanline[x]);
auto pixel_y_minus_1 = Pixel::gfx_to_png(scanline_minus_1[x]);
none_filter.append(pixel);
TRY(none_filter.append(pixel));
sub_filter.append(pixel - pixel_x_minus_1);
TRY(sub_filter.append(pixel - pixel_x_minus_1));
up_filter.append(pixel - pixel_y_minus_1);
TRY(up_filter.append(pixel - pixel_y_minus_1));
// The sum Orig(a) + Orig(b) shall be performed without overflow (using at least nine-bit arithmetic).
auto sum = AK::SIMD::to_u16x4(pixel_x_minus_1) + AK::SIMD::to_u16x4(pixel_y_minus_1);
auto average = AK::SIMD::to_u8x4(sum / 2);
average_filter.append(pixel - average);
TRY(average_filter.append(pixel - average));
paeth_filter.append(pixel - PNG::paeth_predictor(pixel_x_minus_1, pixel_y_minus_1, pixel_xy_minus_1));
TRY(paeth_filter.append(pixel - PNG::paeth_predictor(pixel_x_minus_1, pixel_y_minus_1, pixel_xy_minus_1)));
pixel_x_minus_1 = pixel;
pixel_xy_minus_1 = pixel_y_minus_1;
@ -246,28 +259,28 @@ void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
if (abs(best_filter.sum) > abs(paeth_filter.sum))
best_filter = paeth_filter;
uncompressed_block_data.append(to_underlying(best_filter.type));
uncompressed_block_data.append(best_filter.buffer);
TRY(uncompressed_block_data.try_append(to_underlying(best_filter.type)));
TRY(uncompressed_block_data.try_append(best_filter.buffer));
}
auto maybe_zlib_buffer = Compress::ZlibCompressor::compress_all(uncompressed_block_data, Compress::ZlibCompressionLevel::Best);
if (!maybe_zlib_buffer.has_value()) {
// FIXME: Handle errors.
VERIFY_NOT_REACHED();
return Error::from_string_literal("PNGWriter: ZlibCompressor failed");
}
auto zlib_buffer = maybe_zlib_buffer.release_value();
png_chunk.add(zlib_buffer.data(), zlib_buffer.size());
add_chunk(png_chunk);
TRY(png_chunk.add(zlib_buffer.data(), zlib_buffer.size()));
TRY(add_chunk(png_chunk));
return {};
}
ErrorOr<ByteBuffer> PNGWriter::encode(Gfx::Bitmap const& bitmap)
{
PNGWriter writer;
writer.add_png_header();
writer.add_IHDR_chunk(bitmap.width(), bitmap.height(), 8, PNG::ColorType::TruecolorWithAlpha, 0, 0, 0);
writer.add_IDAT_chunk(bitmap);
writer.add_IEND_chunk();
TRY(writer.add_png_header());
TRY(writer.add_IHDR_chunk(bitmap.width(), bitmap.height(), 8, PNG::ColorType::TruecolorWithAlpha, 0, 0, 0));
TRY(writer.add_IDAT_chunk(bitmap));
TRY(writer.add_IEND_chunk());
return ByteBuffer::copy(writer.m_data);
}

10
Userland/Libraries/LibGfx/PNGWriter.h
View file

@ -23,11 +23,11 @@ private:
PNGWriter() = default;
Vector<u8> m_data;
void add_chunk(PNGChunk&);
void add_png_header();
void add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG::ColorType color_type, u8 compression_method, u8 filter_method, u8 interlace_method);
void add_IDAT_chunk(Gfx::Bitmap const&);
void add_IEND_chunk();
ErrorOr<void> add_chunk(PNGChunk&);
ErrorOr<void> add_png_header();
ErrorOr<void> add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG::ColorType color_type, u8 compression_method, u8 filter_method, u8 interlace_method);
ErrorOr<void> add_IDAT_chunk(Gfx::Bitmap const&);
ErrorOr<void> add_IEND_chunk();
};
}